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You searched for +publisher:"Florida State University" +contributor:("Marcus Huettel"). Showing records 1 – 3 of 3 total matches.

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Florida State University

1. Tazaz, Amanda Maaza. Isotopic Characterization of Methane Obtained from Hypersaline Environments.

Degree: PhD, Earth, Ocean and Atmospheric Sciences, 2013, Florida State University

The recent reports of methane in the atmosphere of Mars, as well as the findings of hypersaline paleoenvironments on that planet, have underscored the need to evaluate the importance of biological (as opposed to geological) trace gas production and consumption, particularly in hypersaline environments. Methane in the atmosphere of Mars may be an indication of extant life, but it may also be a consequence of geologic activity and/or the thermal alteration of ancient organic matter. On Earth these methane sources can be distinguished using stable isotopic analyses and the ratio of methane (C1) to C2 and C3 alkanes present in the gas source (C1/(C2+C3)). We report here that methane produced in hypersaline environments on Earth has an isotopic composition and alkane content outside the values presently considered to indicate a biogenic origin. Higher salinity endoevaporites yielded what would be considered nonbiogenic methane based upon stable isotopic and alkane content, however incubation of crustal and algal mat samples resulted in methane production with similar isotopic values. Radiocarbon analysis indicated that the production of the methane was from recently fixed carbon. An extension of the isotopic boundaries of biogenic methane is necessary in order to avoid the possibility of false negatives returned from measurements of methane on Mars and other planetary bodies.

A Dissertation submitted to the Department of Earth, Ocean and Atmospheric Science in partial fulfillment of the requirements for the degree of Doctor of Philosophy.

Fall Semester, 2013.

October 15, 2013.

Carbon, Hydrogen, Hypersaline, Isotope, Methane

Jeffery Chanton, Professor Directing Dissertation; Patrick Mason, University Representative; Marcus Huettel, Committee Member; Yang Wang, Committee Member; Laura Lapham, Committee Member.

Advisors/Committee Members: Jeffery Chanton (professor directing dissertation), Patrick Mason (university representative), Marcus Huettel (committee member), Yang Wang (committee member), Laura Lapham (committee member).

Subjects/Keywords: Earth sciences; Oceanography; Atmospheric sciences; Geophysics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Tazaz, A. M. (2013). Isotopic Characterization of Methane Obtained from Hypersaline Environments. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-8719 ;

Chicago Manual of Style (16th Edition):

Tazaz, Amanda Maaza. “Isotopic Characterization of Methane Obtained from Hypersaline Environments.” 2013. Doctoral Dissertation, Florida State University. Accessed January 24, 2020. http://purl.flvc.org/fsu/fd/FSU_migr_etd-8719 ;.

MLA Handbook (7th Edition):

Tazaz, Amanda Maaza. “Isotopic Characterization of Methane Obtained from Hypersaline Environments.” 2013. Web. 24 Jan 2020.

Vancouver:

Tazaz AM. Isotopic Characterization of Methane Obtained from Hypersaline Environments. [Internet] [Doctoral dissertation]. Florida State University; 2013. [cited 2020 Jan 24]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-8719 ;.

Council of Science Editors:

Tazaz AM. Isotopic Characterization of Methane Obtained from Hypersaline Environments. [Doctoral Dissertation]. Florida State University; 2013. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-8719 ;


Florida State University

2. Paeng, Jiyoung. Combustion-Derived Dissolved Organic Matter in Aquatic and Marine Environments.

Degree: PhD, Earth, Ocean and Atmospheric Sciences, 2012, Florida State University

Fire-derived compounds have received considerable attention as a refractory form of dissolved organic carbon (DOC), the largest carbon pool in the ocean. Due to its recalcitrant nature, pyrogenic or black carbon, which is produced by the incomplete combustion of biomass and fossil fuel on land, is an important compound for potential long-term carbon sequestration. The major objective of this dissertation was to test the hypothesis that dissolved pyrogenic organic carbon accounts for a significant fraction of DOC in different environmental systems, and that the distribution and transport of pyrogenic DOC may be an important key to understanding of how terrestrial and marine DOC are linked. To test this hypothesis, solid phase extraction of DOC was coupled with the benzene polycarboxylic acid (BPCA) method for accurate analysis of combustion-derived compounds in the Southern Ocean, rivers and estuaries in southeastern Brazil, Minnesota's peatlands, and the groundwater and coastal ocean of the Gulf of Mexico. The homogenous distribution of the thermogenic signatures including pyrogenic and non-pyrogenic sources found in marine DOC across whole water masses in the deep ocean indicated that thermogenic DOC can act as a long-term sink. Approximately 2% of the DOM in the deep ocean was determined to be of thermogenic origin, derived from ancient biomass burning, and, possibly, the geothermal flux in the deep sea. Dissolved pyrogenic carbon was found to account for up to 9 ± 2% of riverine and estuarine DOC. Pyrogenic DOC entering the watersheds in Brazil appeared to be derived mainly from former forest fires rather than current agricultural uses, in particular sugarcane burning. Dissolved pyrogenic carbon flux was affected by seasonal variability in runoff and water management in reservoirs. Inputs of pyrogenic DOC to the ocean via groundwater were identified, revealing groundwater discharge as a newly-discovered source of marine dissolved pyrogenic carbon. Large amounts of pyrogenic DOC were found in the peatlands of northern Minnesota. Such fire-derived materials are likely derived from old peat soil, thus, the export of aged condensed aromatic compounds from peatlands has implications for our understanding of the oceanic carbon cycle. Results of lignin phenols analysis indicated that the pyrogenic DOC in the peatlands might have originated from non-vascular plant-derived materials with highly altered lignin signatures. A multi-proxy approach, including both molecular tracers (BPCA and lignin oxidation products) and the stable carbon isotopic composition of bulk DOC, was adopted to investigate the sources and cycling of terrestrial and pyrogenic organic matter in a fire-impacted coastal watershed in the northern Gulf of Mexico. The distinct trends in the temporal and spatial variations of pyrogenic DOC in groundwater reflected the coupling of groundwater discharge and estuarine processes in creating the conditions for the transport of terrestrial DOC to the ocean. The calculated pyrogenic DOC flux transport by groundwater… Advisors/Committee Members: Jeffrey P. Chanton (professor directing dissertation), William T. Cooper (university representative), Thorsten Dittmar (committee member), Marcus Huettel (committee member), William Landing (committee member).

Subjects/Keywords: Earth sciences; Oceanography; Atmospheric sciences; Geophysics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Paeng, J. (2012). Combustion-Derived Dissolved Organic Matter in Aquatic and Marine Environments. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-5087 ;

Chicago Manual of Style (16th Edition):

Paeng, Jiyoung. “Combustion-Derived Dissolved Organic Matter in Aquatic and Marine Environments.” 2012. Doctoral Dissertation, Florida State University. Accessed January 24, 2020. http://purl.flvc.org/fsu/fd/FSU_migr_etd-5087 ;.

MLA Handbook (7th Edition):

Paeng, Jiyoung. “Combustion-Derived Dissolved Organic Matter in Aquatic and Marine Environments.” 2012. Web. 24 Jan 2020.

Vancouver:

Paeng J. Combustion-Derived Dissolved Organic Matter in Aquatic and Marine Environments. [Internet] [Doctoral dissertation]. Florida State University; 2012. [cited 2020 Jan 24]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5087 ;.

Council of Science Editors:

Paeng J. Combustion-Derived Dissolved Organic Matter in Aquatic and Marine Environments. [Doctoral Dissertation]. Florida State University; 2012. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-5087 ;


Florida State University

3. Misra, Sambuddha. Lithium Isotope Evolution of Cenozoic Seawater.

Degree: PhD, Earth, Ocean and Atmospheric Sciences, 2010, Florida State University

This study presents the first high-resolution long-term history of seawater lithium isotope ratio (δ7LiSW) reconstructed from analyses of chemically cleaned planktonic foraminifera. The lithium isotope ratio of seawater (δ7LiSW ~31.0‰) is at secular equilibrium with its input sources via chemical weathering of the silicate continents (δ7LiRiv ~23‰), hydrothermal weathering of seafloor silicate basalts (δ7LiHT ~5.6‰) and removal by reverse weathering of authigenic sediments and seafloor basalts (δ7LiSED ~15‰). The δ7LiSW preserved in marine calcitic planktonic foraminifera provides a unique time tracer of changes in the global silica cycle. The Cenozoic 7Li/6Li record of seawater was constructed by analyzing over 300 age and species overlapping foraminifera samples, including both individual species and 'reverse picked' bulk foraminifera samples, from eight DSP/ODP Sites (588, 757, 758, 926, 1262, 1263, 1265, and 1267) with existing high resolution strontium isotope record. To meet the analytical requirements of foraminiferal δ7Li analyses an improved quadrupole-ICP-MS method for 7Li/6Li determination with low total lithium consumption (<0.2 ng/quintuplicate analyses) and high isotope ratio precision (≤ ±0.8‰, 2σ) was developed. A refined single step ion-exchange chromatographic method for quantitative lithium seperation, characterized by low blanks (1.0 ± 0.5 pg-Li) and high column yields (>99.98%), was also developed. The effects of foraminifera cleaning on calcite bound lithium concentrations and isotopic compositions were evaluated. A new analytical ICP-MS method for simultaneous determination of lithium, magnesium, manganese, vanadium, strontium, and barium ratios to calcium in chemically cleaned planktonic foraminifera was also developed. The newly developed analytical method and the improved foraminiferal cleaning technique was applied to late Cretaceous and Cenozoic samples to investigate the correlation between lithium isotopic composition and their lithium, magnesium, and strontium concentrations of the calcite shell as a guide to the to better explain the δ7Li record of seawater. The 68 Ma history of δ7LiSW spanning Late Cretaceous to Holocene demonstrates that the δ7LiSW decreased sharply by ~5‰ at the Cretaceous-Tertiary boundary and during the rest of the Cenozoic δ7LiSW increased by 8-9‰ over the last 60 Ma. Unlike the 87Sr/86Sr and 187Os/186Os isotope history of seawater, the rise in δ7LiSW during Cenozoic is not monotonous in nature. Plateaus and quasi-linear increases in δ7LiSW punctuate the 8-9‰ rise in seawater δ7Li during the Cenozoic. The sharp drop in δ7LiSW across K-Pg boundary was probably due to rapid supply large masses of isotopically light lithium to seawater from the congruent weathering of freshly erupted continental flood basalts (CFB's of Deccan Traps). The 8-9‰ rise in δ7LiSW during the rest of the Cenozoic suggests that hydrothermal contribution of isotopically light lithium to seawater has decreased over the Cenozoic, whereas, both lithium flux (FRiv) and isotopic composition… Advisors/Committee Members: Philip N. Froelich (professor directing dissertation), Munir Humayun (university representative), Willium C. Burnett (committee member), Jeffery P. Chanton (committee member), Marcus Huettel (committee member).

Subjects/Keywords: Oceanography; Atmospheric sciences; Meteorology

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Misra, S. (2010). Lithium Isotope Evolution of Cenozoic Seawater. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-2387 ;

Chicago Manual of Style (16th Edition):

Misra, Sambuddha. “Lithium Isotope Evolution of Cenozoic Seawater.” 2010. Doctoral Dissertation, Florida State University. Accessed January 24, 2020. http://purl.flvc.org/fsu/fd/FSU_migr_etd-2387 ;.

MLA Handbook (7th Edition):

Misra, Sambuddha. “Lithium Isotope Evolution of Cenozoic Seawater.” 2010. Web. 24 Jan 2020.

Vancouver:

Misra S. Lithium Isotope Evolution of Cenozoic Seawater. [Internet] [Doctoral dissertation]. Florida State University; 2010. [cited 2020 Jan 24]. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-2387 ;.

Council of Science Editors:

Misra S. Lithium Isotope Evolution of Cenozoic Seawater. [Doctoral Dissertation]. Florida State University; 2010. Available from: http://purl.flvc.org/fsu/fd/FSU_migr_etd-2387 ;

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